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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Allowance (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) alternative | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |
Minimum balance of adversely classified loan in which a detailed analysis is performed | $ 250 |  |
Number of alternatives for measuring impaired loans receivable | alternative | 3 |  |
Balance, beginning of year | $ 19,977 | $ 16,753 | $ 14,576
Provision for loan losses | 8,667 | 7,462 | 2,826
Losses charged off | (2,993) | (5,195) | (1,675)
Recoveries | 538 | 957 | 1,026
Balance, end of period | 26,189 | 19,977 | 16,753
Individually evaluated for impairment | 2,044 | 614 | 858
Collectively evaluated for impairment | 22,910 | 19,354 | 15,881
Ending balance | 2,644,519 | 1,939,501 | 1,825,992
Individually evaluated for impairment | 16,980 | 13,086 | 5,266
Collectively evaluated for impairment | $ 2,611,916 | 1,926,156 | 1,812,640
Unsecured Open-end Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Period When Loans Are Charged Down | 180 days |  |
Other Secured Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Period When Loans Are Charged Down | 120 days |  |
Commercial/Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | $ 16,546 | 12,901 | 11,379
Provision for loan losses | 6,070 | 6,884 | 1,467
Losses charged off | (1,227) | (3,795) | (747)
Recoveries | 167 | 556 | 802
Balance, end of period | 21,556 | 16,546 | 12,901
Individually evaluated for impairment | 1,816 | 586 | 192
Collectively evaluated for impairment | 18,514 | 15,951 | 12,695
Ending balance | 1,784,741 | 1,371,787 | 1,204,799
Individually evaluated for impairment | 14,422 | 11,372 | 1,956
Collectively evaluated for impairment | 1,756,908 | 1,360,156 | 1,199,003
Agriculture/Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | 1,742 | 2,249 | 1,337
Provision for loan losses | 548 | 153 | 933
Losses charged off | (93) | (662) | (30)
Recoveries | 0 | 2 | 9
Balance, end of period | 2,197 | 1,742 | 2,249
Individually evaluated for impairment | 0 | 2 | 660
Collectively evaluated for impairment | 2,197 | 1,740 | 1,589
Ending balance | 367,211 | 213,521 | 212,513
Individually evaluated for impairment | 32 | 488 | 1,345
Collectively evaluated for impairment | 367,175 | 213,033 | 211,168
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | 886 | 874 | 994
Provision for loan losses | 1,447 | 100 | 113
Losses charged off | (886) | (217) | (234)
Recoveries | 57 | 129 | 1
Balance, end of period | 1,504 | 886 | 874
Individually evaluated for impairment | 225 | 25 | 6
Collectively evaluated for impairment | 1,270 | 861 | 868
Ending balance | 392,526 | 315,123 | 366,823
Individually evaluated for impairment | 2,360 | 1,026 | 1,752
Collectively evaluated for impairment | $ 387,961 | 314,097 | 360,825
1-4 Family residential properties |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Period When Loans Are Charged Down | 180 days |  |
Consumer loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | $ 803 | 693 | 642
Provision for loan losses | 602 | 361 | 501
Losses charged off | (787) | (521) | (664)
Recoveries | 314 | 270 | 214
Balance, end of period | 932 | 803 | 693
Individually evaluated for impairment | 3 | 1 | 0
Collectively evaluated for impairment | 929 | 802 | 693
Ending balance | 100,041 | 39,070 | 41,857
Individually evaluated for impairment | 166 | 200 | 213
Collectively evaluated for impairment | 99,872 | 38,870 | 41,644
Unallocated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | 0 | 36 | 224
Provision for loan losses | 0 | (36) | (188)
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 0 | 0 | 36
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 0 | 0 | 36
Ending balance | 0 | 0 | 0
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 0 | 0 | 0
Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 1,235 | 9 | 14
Financing Receivable, Net | 15,623 | 259 | 8,086
Financial Asset Acquired with Credit Deterioration [Member] | Commercial/Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 1,226 | 9 | 14
Financing Receivable, Net | 13,411 | 259 | 3,840
Financial Asset Acquired with Credit Deterioration [Member] | Agriculture/Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 0 | 0 | 0
Financing Receivable, Net | 4 | 0 | 0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 9 | 0 | 0
Financing Receivable, Net | 2,205 | 0 | 4,246
Financial Asset Acquired with Credit Deterioration [Member] | Consumer loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 0 | 0 | 0
Financing Receivable, Net | 3 | 0 | 0
Financial Asset Acquired with Credit Deterioration [Member] | Unallocated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 0 | 0 | 0
Financing Receivable, Net | $ 0 | $ 0 | $ 0

X
- Definition Amount net of deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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